The Rangers aren't a better team than the Blue Jays. Worse on offense, defense and the rotation isn't as good although that can be mitigated if they are able to throw Hamels and Darvish a total of 4 times in a 5 game series which they could do simply by throwing Hamels Game 1 and then again on 3 days rest in Game 4. Darvish would be able to pitch on normal rest in Games 2 and 5. Rangers bullpen is better but the metrics don't really like them.
But even though the Jays are better that barely matters in a single playoff series, especially when it's just 5 games.